# How is power rating calculated in autotransformer?

## How is power rating calculated in autotransformer?

kVA rating calculation: kVA rating of the autotransformer is equal to the kVA rating of the two winding transformers divided by one minus transformation ratio.

How is auto transformer current calculated?

It means actual winding power handling capacity is only 1015 KVA but this autotransformer can handle 5000 KVA means auto transformer can handle 5 times more power and 5 times smaller than a conventional 2 winding transformer. Apparent Current = 1015 Kva/220 = 1015 x 1000/220= 4613.63 A.

How do you calculate the power of a transformer?

Since you know kVA = V * l / 1,000, we can solve for V to get V = kVA * 1,000 / l. So you’ll multiply your kVA rating by 1,000 and then divide by the amperage. If your transformer has a kVA rating of 75 and your amperage is 312.5, you’ll plug those numbers into the equation — 75 * 1,000 / 312.5 = 240 volts.

### How do you vary the PF using two auto transformers?

Answer. Answer: The Autotransformer have many advantages over conventional double wound transformers. They are generally more efficient for the same VA rating, are smaller in size, and as they require less copper in their construction, their cost is less compared to double wound transformers of the same VA rating.

Why can auto transformer handle more power than conventional transformer of the same size?

An auto transformer has higher efficiency than two winding transformer. This is because of less ohmic loss and core loss due to reduction of transformer material. Auto transformer has better voltage regulation as voltage drop in resistance and reactance of the single winding is less.

What is the formula for power factor 12?

Also, cos ϕ = R / Z. Range of power factor for an AC circuit lies between 0 and 1….Related Stories.

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## What is electric power formula?

The electric power is given by P = VI. Where V is the potential difference, I is the electric current and P is the electric power.

How is MVA power calculated?

MVA rating calculation formula: MVA (Mega Volt-Amp) rating of the transformer S(MVA) is equal to the product of primary current I(Primary) in amps and Primary Voltage V(primary) in volts divided by 1000000.